Optical recording medium having a relationship between groove width and track pitch

a technology of optical recording medium and groove width, applied in the field of optical recording and reproducing medium substrate, can solve the problems of inability to directly apply the conventional manufacturing method to the optical disk, the groove width cannot be relatively easily formed, and the production method of ultra-high density optical disk is not only excellent in actual practice, but also satisfactory in yield, so as to achieve satisfactory recording and reproducing characteristics and high accuracy.
US7548505B2Inactive Publication Date: 2009-06-16SONY CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
SONY CORP
Publication Date
2009-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

An optical recording / reproducing medium having grooves formed along recording tracks and used for recording / reproducing when irradiated with light L with a specified wavelength λ, wherein the track pitch p of a groove is at least 200 nm and up to 350 nm, and a ratio wg′ / p between the width wg of a groove and a track pitch p is at least 0.24 and up to 0.67.
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Description

TECHNICAL FIELD

[0001] The present invention relates to an optical recording and reproducing medium substrate suitable, a manufacturing method of optical recording and reproducing medium manufacturing stamper and an optical recording and reproducing medium manufacturing stamper for use with an optical recording and reproducing medium having grooves formed along recording tracks.BACKGROUND ART

[0002] Various kinds of optical disks shaped like discs for optically recording and / or reproducing information are put into practical use as optical recording and reproducing mediums. A read-only optical disk having embossed pits formed on a disk substrate beforehand, a magneto-optical disk for recording data by magneto-optical effect and a phase-change optical disk for recording data by phase-change of a recording film are available as such optical disks.

[0003] Of these optical disks, in the optical disk in which data can be written, such as a magneto-optical disk and a phase-change optical disk, i...

Claims

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